Improved sgkew-olamp foe plankizw vessels



J. D. HATHAWAY.

scm-..Wl CLAMP PoR PLANUNG VESSBLS.

No. 66,332. Patented June 2, 1867:.

l @uitrit-.tatie atnt ffrz.

IMPROVED SCREW-CLAMP FOR PLANKIN G VBSSELS.

' @he Stlgthule referrer tu in fliet' Enters lgatentautmnking pint nftigt snm.

TO ALL WHOM I'l MAY CONCERN:

Be it known that I, JAMEs D. HATHAWAY, of'A Medford, in the county ofMiddlesex, and Commonwealth of iassachusetts, have inventeda new andimproved Screw-Clamp for Flanking Vessels and I do hereby declare thefollowing to be, a full and exact description thereof, reference beinghad to thc accompanying drawings, and `tothe letters of reference markedthereon, in which- Figure 1 is a side view of the instrument Figure 2isan edge vicwof the same. l V

The nature of my invention consists in so construe-ting the screw-clampthat, when used in planking a vessel which is sealed up on the'inside,one end, a, of the clamp may be inserted between the knees or timbers ofthc vessel, and held there firmly by means of the serratedcam b,attached to one end of' the clamp, while the other end comes out overthe plank to be brought and held in position to be fastened Vto theoutside oil' the timbers.

To.enable others skilled in the art to makevand use my invention, I willnroc-ecd vto describe its construction andoperation. i i

I make the clamp-frame c of any'desired shape and strength. I tlicnattach Ytothef shorter end d ot` the frame u a serrated cam, z, havingaperforation near its smaller end {it-ted to go on and-turn upon saidshorter end d ot' the frame c, prepared for that purpose as nn axle. Theaxle may be provfrled with a n'nt and screw to hold the cam b in itsplace, or it muy be headed down to hold it as in the drawings. l'lheadvantage ofthe nut and screw is to facilitato the exchange of onecamfor another when the timbers are different distances apart andrequire cams 0f different sizes. I cnstructrthe cam in the ordinary way,but. make its axis of revolution nearer the smaller end, and cut teeth ee in the larger' end opposite its axishof revolution. In the other orlonger end of t'ruie c is cut a female screw, f, 'into which is fittedVthe male screwg, to the inner end of which is attached a head or cap,`,so made as to allow the screw g to be turned, when the cap is placedagainst any substance, without the cap itself revolving. The outer endof screw g is provided with a suitable handle, z', for turning thescrewi A By insertn'g'the end of the clamp having the cam attachedbetween the knees` or timbers of the vessel, the teeth e e fix into onetimber, and the smaller end braces against the opposite timber',` sothat when power is applied to draw it outward it takes fast hold, andbecomes more `firmly attached the great-or the= powcr applied. The cap zof' the male screw g is then brought to hear upon the plank to bcattached to the outside of the timbers, and by turning the screw g it isAbrought up against the timbers and held there until fastened.

I am aware that screw-clamps have been in use for a. longtime. Minediffers from them in construction.

I do `not claim the screw-clamp patented to Abram Perrin April 5, 1864;but I claim, and desire tosecure by Letters Patent- A screu'clamp,,consisting of a frame,`a Ina-le and female screw, and a serrated cam,combined and operating substantially as described.

JAMES D. HATHAWAY.

Witnesses:

A. BADGER, JAMES O. CURTIS.

